2022 Fiscal Year Final Research Report
Long-term variations of radiocesium in houses inside the Fukushima evacuation zones
| Project/Area Number |
19K12306
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Multi-year Fund |
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| Section | 一般 |
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| Review Section |
Basic Section 63010:Environmental dynamic analysis-related
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| Research Institution | The University of Tokyo |
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Principal Investigator |
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| Co-Investigator(Kenkyū-buntansha) |
堀 まゆみ 東京大学, 教養学部, 特任助教 (50782869)
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| Project Period (FY) |
2019-04-01 – 2023-03-31
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| Keywords | 放射性セシウム / 家屋内汚染 / 帰還困難区域 |
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| Outline of Final Research Achievements |
In order to clarify the state of contamination in houses in Fukushima evacuation zone over time, radioactive cesium trapped on clothes in a house was periodically measured and the degree of contamination in the house was quantitatively evaluated against the time scale. It was found that the factors most affecting the contamination in a house depended on the airtightness of the house itself and the frequency of entry and exit, not on the degree of contamination outside the house.
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| Free Research Field |
環境分析化学
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| Academic Significance and Societal Importance of the Research Achievements |
本研究によって家屋内の汚染の要因は家の気密性や窓やドアを開ける頻度に依存することが強く推測されました。気密性が高く、かつ出入りがほとんどない家屋の場合には、家屋周りの汚染度が高い場合でも家屋に放射性セシウムが混入してくる割合は低いことになります。一方で破損等で気密性が落ちてしまった家屋の場合、あるいは頻繁に出入りがあった場合には、家屋外の沈着量と差が生じない可能性もあります。この観測結果は中長期的な避難指示解除後の被ばく量を低減させるうえでも重要な基礎的知見になると考えられます。
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